Engine exhaust muffler



Jan. 15, 1946. 4 E. A; KLIEWER.-SR 2,392,989 I ENGINE EXHAUST MUFFLER Filed Dec. 17, 1943 2 Shee'ts-Shet 1 0'0 0 o 0 ago ,0 o o 0150 3nventor 2 Sheets-Shet 2 Filed Dec. 17, 1943 E. KLIEWER, SR

ENGINE EXHAUST MUFFLER 000000000 OOOOOO Jan. 15, 1946.

Inventor E.A.Kh.ewer,8r.

fiium/ Gttomegs Patented Jan. 15, 1946 UNITED STATES PATENT OFFICE 2,392,989 ENGINE EXHAUST MUFFLER Edward Albert Kliewer, Sn, Longview; Tex.

Application December 17, 1943, Serial No. 514,704

11 Claims.

The invention relates generally to acoustics and primarily seeks to provide a novel muifler structure adapted for use on motor cars for silencing the exhausting of burnt gases from the internal combustion engines customarily employed therein.

An object of the invention is to provide a simple and inexpensively manufactured muiiler structure in which the exhaust gases are permitted to gradually expand in a manner for very efliciently silencing the exhausting process, back pressure against the motor to which the muffler is attached being almost completely eliminated with resulting saving of gasoline and oil, greater efliciency in operation of said motor, and longer life of both the muliler and the motor.

With the above and other objects in view that will hereinafter appear, the nature of the invention will be more fully understood by following the detailed description, the appended claims and the several views illustrated in the accompanying drawings.

In the drawings:

Figure 1 is a central longitudinal sectional view illustrating the improved mufiier structure.

. Figure 2 is a vertical cross section taken on the line 2--2 on Figure 1.

Figure 3 is an enlarged fragmentary vertical cross sectional view taken through the concentric shell and corrugated sleeve wall structure.

Figure 4 is a detail vertical longitudinal section taken on the line 4-4 on Figure 3.

Figure 5 is a view similar to Figure 1 illustrating a modified form of the invention.

Figure 6 is a vertical cross section taken on the line 6-45 on Figure 5.

In the example of embodiment of the invention illustrated in Figures 1 through 4 the improved muffler structure includes a generally cylindrical body having a flaring frusto-conical extension 6 at the end thereof adapted to be disposed toward the motor with which the muilier is associated, and a. tapering frusto-conical extension I at its other end.

A plurality of cylindrical shells 8 are mounted in concentrically spaced relation with each other and with the body 5 within said body, and in the longitudinal annular space provided between each pair of shells and between the outermost shell 8 and the adjacent body 5 there is mounted a corrugated sleeve 9. The corrugations of the sleeve, touching the opposing walls of the body 5 and the shells 8 serve to provide a multiplicity of individual longitudinal passages I0. It will be observed by reference to Figure 3 of the drawings that the ends of the sheets which form the corrugated sleeves 9 are overlapped so that the corrugations thereof interlock as at H and facilitate the securing of the assembly or circular form of said sleeves,

The innermost shell 8 is provided with a closure head I2 at the end thereof adjacent the discharge end of the muflier, and the head is perforated as at I3.

A cylindrical tube 14 is mounted in concentrically spaced relation within the innermost shell 8 on mounting rods I5 in the manner clearly illustrated in Figures 1 and 2 of the drawings from which it will be observed that the inner or discharge end of the tube is spaced as at I 6 from the shell closure head [2. The walls of the tube I4 within the innermost shell 8 and within the flaring frusto-cone 6 are perforated, and the receiving end of the tube is extended imperforate through the receiving end of said frusto-cone as at ll. The perforations in the tube I4 are indicated at H3.

The ends of the corrugated sleeves 9 are inwardly beveled as at H! at the discharge ends of the shells 8, or in other words at the location of the inner shell closure head I2.

A frusto-conical bafile 20 is mounted in the tapering frusto-cone I just beyond the inner shell closure head l2 and the discharge ends of the longitudinal passages l0, and the baffle 20 directs gases inwardly and endwise against a deflector cone 2| which is mounted in the tapering frustocone 1 in the position illustrated in Figure 1. The deflector cone is notched as at 22 at its base so as to permit passage of gases into the cylindrical outlet 23 extending from the tapering frusto-cone 1.

Exhaust gases entering the tube l4 through the receiving end extension l1 thereof pass through the tube into the interior of the innermost shell 8, some of said gases passing directly through the tube apertures I8 into the surrounding space. Beyond the tube l4 within the innermost shell 8 the gases are turned forwardly about the tube l4 and into the flaring frusto-cone 6 and from thence into the receiving ends of the multiplicity .of individual longitudinal passages III formed by the corrugated sleeves 9. It will be obvious that some of the gases pass directly through the apertures I3 in th inner shell closure head l2 into the tapering frusto-cone 1. The gases passing through the corrugated sleeve passages I0 are discharged at the beveled ends IQ of the sleeves into the space between the inner shell closure head "and the rrusto-conical baflie 20 and are directed inwardly and endwise by said baffle against the deflector cone 2! which deflects them outwardly against the tapering walls of the frusto-cone I from whence they pass through the deflector cone notches 22 and out through the discharge outlet 23. It will be observed that the internal diameter of the outlet 23 is considerably larger than the internal diameter of the tube end H. In following the above described course the gases are gradually expanded while exhaustin in a manner for almost completely eliminating noise and also back pressure against the motor to which the muffler is attached.

The muliler structure hereinabove described is simple in design and can be manufactured at low cost. One feature is that this muffler can be adapted for use on many makes of present day automobile, thus making it adaptable for replacement purposes without the necessity of carrying in stock a wide range of models and sizes. The efficiency of the muffler in eliminating noise is of great advantage, and the almost complete elimination of back pressure against the motor results in great saving of gasoline, great reduction in the number of replacements of mufflers due to burning out, longer life of the mufiler and also the motor to which it is attached by reason of reduction of heat and the amount of oil necessary to be used.

In Figures 5 and 6 of the drawings a modified form of the invention is illustrated. In this form of the invention the muffler structure is constructed and operates in generally the same manner previously described, but it will be noted that the central, perforated cylindrical tube I l is provided with an end closure 24 having one or more apertures 25. A plurality of disks 26 are rigidly secured on the tube 14* in longitudinally spaced relation, said disks being of a diameter less than the internal diameter of the innermost one of the cylindrical shells 8*, thereby to provide annular gas passages between said innermost shell and the disk baffles in the manner clearly shown in Figure 6. Instead of the corrugated sleeves interposed between the shells as shown in the first described form of the invention, the mufiler structure of Figures 5 and 6 is equipped with a plurality of circumferentially spaced, longitudinal divider elements 21. The elements 21 serve to provide longitudinal channels for the escaping exhaust gases, said spaces being confined, but to a lesser degree than the comparable longitudinal spaces or passages provided in the muffler structure of Figures 1 through 4.

The provision of the perforated tube closure 24, the tube surrounding bafile disks 26 and the relatively widely spaced divider elements 21, will be found to provide for quieter and smoother flow and expansion of the exhaust gases in certain types of installation.

It is of course to be understood that the details of struotiu'e and the arrangement of parts may be variously changed and modified without departing from the spirit and scope of the invention.

I claim:

1. An engine exhaust silencing muffler comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frusto-conical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a cylindrical shell spaced within the body and providing therewith a longitudinal annular gas passage communicating at its ends with said frustoconical extensions, a head closing the end of said shell adjacent the tapering frusto-conical extension, and an open ended tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frusto-conical extension perforated, said head being provided with apertures communicating directly between the interior of the shell and the tapering frustoconical extension.

2. An engine exhaust silencing mufiler comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frustoconical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a cylindrical shell spaced within the body and providing therewith a longitudinal annular gas passage communicating at its ends with said frusto-conical extensions, a head closing the end of said shell adjacent the tapering frusto-conical extension, an open ended tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frusto-conical extension perforated, and a corrugated sleeve placed between the shell and the body with its corrugations disposed to provide a multiplicity of individual longitudinal passages through the longitudinal annular passage.

3. An engine exhaust silencing muffler comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring irusto-conical extension at said receiving end, a tapering frusto conical extension at said discharge end, a cylindrical shell spaced within the body and providing therewith a longitudinal annular gas passage communicating at its ends with said frusto-conical extensions, a head closing the end of said shell adjacent the tapering frustoconical extension, an open ended tube extending through the flaring frusto-conical extension and part Way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frusto-conical extension perforated, a frusto-conical baffle mounted in the tapering frusto-conical extension in position for being impinged upon by gases discharging from the annular space and directing said gases inwardly, and a deflector cone mounted in the tapering frusto-conical extension in position for being engaged by the inwardly directed gases and directing them outwardly toward the muffler outlet.

4. An engine exhaust silencing muffler comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frustoconical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a cylindrical shell spaced within the body and providing therewith a longitudinal annular gas passage communicating at its ends with said frusto-conical extensions, 9 head closing the end of said shell adjacent the tapering frusto-conical extension, and an open ended tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the-shell and the flaring frusto-conical extension perforated, said tapering frusto-conical extension having a cylindrical outlet extension of larger diameter than the inlet into the perforated tube.

5. An engine exhaust silencing mulller comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frusto conical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a cylindrical shell spaced within the body and providing therewith a longitudinal annular gas passage communicating at its ends with said frusto-conical extensions, a head closing the end of said shell adjacent the tapering frusto-conical extension, an open ended tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frusto-conical extension perforated, a frusto-conical baifle mounted in the tapering frusto-conical extension in position for being impinged upon by gases discharging from the annular space and directing said gases inwardly, and a deflector cone mounted in the tapering frusto-conical extension in position for being engaged by the inwardly directed gases and directing them outwardly toward the mufiier outlet, said tapering frusto-conical extension having a cylindrical outlet extension of larger diameter than the inlet into the perforated tube.

6. An engine exhaust silencing mufller comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frustoconical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a plurality of cylindrical shells concentrically spaced one within the other and within the body and providing with said body a plurality of longitudinal annular gas passages communicating at their ends with said frusto-conical extensions, a corrugated sleeve in each annular space providing a multiplicity of small individual longitudinal passages therethrough, a head closing the end of said shell adjacent the tapering frustoconical extension, and an open ended tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereoi within the shell and the flaring frusto-conical extension perforated.

7. An engine exhaust silencing mufller comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frusto-conical extension at said receiving end, a tapering i'rusto-conical extension at said discharge end, a cylindrical shell spaced within the body and providingtherewith a longitudinal annular gas passage communicating at its ends with said frusto-eonical extensions, a head closing the end of said shell adjacent the tapering frusto-conical extension, an open ended tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frusto-conical extension perforated, and a corrugated sleeve placed between the shell and the body with its corrugations disposed to provide a multiplicity 01' individual iongitudinal passages through the longitudinal annular passage, the ends of said sleeve having their corrugations overlapped in assembly locking relation.

8. A muiller structure as defined in claim 7 in which a frusto-conical baiile is mounted in the tapering frusto-conical extension in position for being impinged upon by gases discharging from the annular space and directing said gases inwardly, and in which there is also included a deflector cone mounted in the tapering frusto-conical extension in position for being engaged by the inwardly directed gases and directin them outwardly toward the muffler outlet, and in which the head is provided with apertures communicating directly between the interior of the shell and the tapering frusto-conical extension.

9. An engine exhaust silencing mufller comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frustoconical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a plurality of cylindrical shells concentrically spaced one within the other and within the body and providing with said body a plurality of longitudinal annular gas passages communicating at their ends with said frusto-conical extensions, a corrugated sleeve in each annular space providing a multiplicity of small individual longitudinal passages therethrough, each said sleeve having its end adjacent the tapering frusto-conical extension inwardly bevelled, a head closing the end of said shell adjacent the tapering irusto-conical extension, and an open ended tube extending through the flaring frusto-conical extension and part wa through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frustoconical extension perforated.

10. An engine exhaust silencing muiller comprising, a generally cylindrical body having a receiving end and a discharge end, a flaring frustoconical extension at said receiving end, a tapering frusto-conical extension at said discharge end, a cylindrical shell spaced within the body and providing therewith a longitudinal annular gas passage communicating at its ends with said frusto-conical extensions, a head closing the end of said shell adjacent the tapering frusto-conical extension, and a tube extending through the flaring frusto-conical extension and part way through said shell short of contact with said head and spaced concentrically within the shell and having the wall portions thereof within the shell and the flaring frusto-conical extension perforated, said perforated tube having a perforated end closure at the end thereof spaced from said shell closing head and a plurality of baflle disks spaced longitudinally therealong and of a diameter less than the internal diameter of said shell.

11. A mufller. structure as defined in claim 10 in which a plurality of circumferentially spaced divider elements extend longitudinally between the shell and the body to provide a multiple of individual longitudinal passages through the longitudinal annular passage.

EDWARD ALBERT KLIEWER, SR. 

